Well, besides annoying a coworker to death with a sick beat on a table, you could use the eraser as a back piece for an earring; Press a reset button on almost any piece of technology that has one; If blinds on the window don’t want to slide down properly you can use it to nudge the gear on the pulley; Use it to point on someone else’s screen without putting your filthy hands on it; Sharpening a pencil is always a good reason to step aside or step away for a minute to take a breather or give someone some space.